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Reply I never had a problem with fish dying with the undergravel filter....then I took it out put in the protein skimmer and then the small filter......should I try replacing the filter and just run the skimmer and undergravel...?

response.... see my previous e-mail for tank size etc....I have a aquaclear filter with sponge, charcoal and bag of pellets (rather small filter)...as far as fish, I have 2 damsels. I eventually want simply 2 precula clowns a yellow blenny??? long body burries itself in the sand at night and...

I have a 35 gallon hexagonal tank and it is saltwater with aprox. 1/4 liverock and apox. 2" of fine coral sand. I used to run just a undegravel filter for years before fish started dying. I bought a protien skimmer and small filter. I have been using the N03 zero nitrate remover and did a 1/3...